You'd have to add If Then Else together with what I typed.
For instance:
If Triggering Player == Player Red
then
Unit - Change color of (Last created unit) to Green
else
Unit - Change color of (Last created unit) to Brown
But you'll have to add all of the players who you want to get greencolored units. Add all of this after you've created the unit.
This should be added in the same trigger that you create the units and directly after if possible.