Note that the quoted text below applies to ALL engines with only a name change:
"Read coolant specs in your Cummins manual or your chassis manual."
This is always the best advice. be it a Cummins, Cat, Detroit Diesel or Chevy or Ford gasser.. Read the manual. NO manual visit the factory store (A Cummins dealer in this case)
The different colors tend to Suggest (not dictate) a type of anti-freeze. Some of them do not mix well with others. Some can cuase real issues if they are put in the wrong engine.
Chevy for a time used a special "Lifetime" coolant on their engines. (I do not know the color)
But you want to stick with the same type the factory put in if you can.
NOTE: you need not buy it at the Cummins shop but find out what kind it is there.