Order filter layered navigation magento

1. Go to Catalog > Attributes > Manage Attributes
2. Go to respective attribute code and click on it
3. Go to Position Field and change the value there
4. If you want size as first then followed by color and type. your Position value for the Size will be 1, it will be 2 for the Color etc.) Save it
5. Clear cache and check the page

If attributes are already shown but not in your required order. You should edit each attribute and look for option "Position" probably is set as "0" just change it with the order number.