Step 1: Go to AdminCP > Usergroups > Usergroup Manager
Step 2: Edit usergroup. You have to do this for each usergroup that you like to be colored.
Step 3: Add this code in username HTML Markup:
First Textbox:
Code:
<span style="color: XXXX;">
Replace "XXXX" with your color name/code, visit www.w3schools.com for a HTML Color Table.
Second Textbox:
Code:
</span>
Save it and you're done!