No, colors used on the card are not tied to a specific suit. Colors only indicate which parts of the hand need to be of the same suit. So, all parts of a hand in blue should be in one suit, the parts in red will be in another suit, and the parts in green in the third suit.
If a hand is shown in only one color, all tiles need to be in the same suit, and that suit can be either cracks, bams or dots (along with their associated dragons).