What do the different colors mean when looking at a roster, like pink, blue, purple, green? I don't see a common factor.

It's just set so each position has its own color to more easily distinguish between the different positions.

just noticed that each one does have a different color which does make sense to do this.

I know it's organized by position, is there a way to get a second default to organize by ratings within the positions?

Say if you have 4 RBs the #1 running back may be listed third.