Does careful selection of graph colors in a manuscript have any positive impact on reviewers?

Some people will tell you that colors shouldn't matter because only data should matter. Those people are wrong.

All human readers (including reviewers) find some graphical presentations easier to digest and comprehend than others, and the choices that matter include color. Of particular note, it is often important to consider color-blind readers, who are up to 10% of males, depending on population, (though many fewer females).

Color sets that work well for color-blind readers often work well for non-color-blind readers as well. You can find a number of good resources online to help you decide what colors to use, such as this "Color Universal Design" site, among many others.

In very general terms bad design from trying too hard has more of a negative impact than lack of sophistication. So the best advice is to keep things as simple as possible.

Some basic guidelines are :

• Keep to a consistent colour palette : it doesn't matter too much if this is bright primaries or more muted tones but be consistent. Primary RGB or CYM are both fine as are teal, beige and maroon but don't just mix and match and keep to one palette across a single document.
• Think about what information you are trying to convey. If you need to use different colours to make superimposed plots distinct then use as many contrasting colours as necessary. If you are just making a simple side-by-side comparison of quantities then stick to one or two complimentary colours.
• Don't use graphic effects (such as drop shadows and colour gradients) which are not strictly part of the information you are trying to convey.

The basic thing to take away is only use graphic elements and colours when you have a clear idea of how they help to make your information clearer. If your graphics work as monochrome flat images then stop there, only add additional complexity to graphics where it has a clear and definite purpose.

Yes, the choice of colours matters and http://colorbrewer2.org/ is a good place to find colour combinations that work well.

Also think about whether 3D plots are really the clearest way to present your data. Though occasionally unavoidable, there are usually better options. 3D plots work best in an online, interactive form, so if people are likely to read your paper as a PDF or in printed form, avoid them if you can. Can you show the same relationships in 2D form? Would a contour plot or heat map be sufficient? If so, one of those is probably a better option.