How to change color of hyperref

Use following. You can change colour as per your choice.

 \usepackage{hyperref}
 \hypersetup{
     colorlinks=true,
     linkcolor=blue,
     filecolor=blue,
     citecolor = black,      
     urlcolor=cyan,
     }

To achieve no color in the hyperlinks use:

\usepackage[hidelinks]{hyperref}

or:

\usepackage{hyperref}
\hypersetup{hidelinks}

Reference