Here is what they mean:
Red is Administrator
Orange is Super Moderator
Lime is Moderator
Purple is Club Staff
Magenta is Site Trader
Dark Green is Punto Sports Club Member
Black is Banned User
and Blue is Registered User (everyone else basically.)
Hope this helps.
1997 Fiat Punto GT Abarth - being restored
2014 Jaguar XFR-S Sportbrake