Is this library sufficient for grouping?

[MinusPL]

Hello, I wonder if this library can be used for grouping problems. In my understanding Graph Coloring problem (edges, not vertices) can be summarized as grouping problem with some restrictions.

Now I understand this library is best suited for optimization problems, but is there a way to use it for graph coloring problems? Trying to work with it for some time, but I start to think that this library is not really suited for graph coloring or grouping problems. Please note that I could be mistaken about graph coloring problems. Anyway, my biggest problem so far is to decide what would be the cost in case of graph coloring. Fitness I can figure out, but cost is out of my scope right now.