Graph Clustering by category

I would like in the graph module to add clusters for objects belonging to the same category.

g.add_node("PHP", category="lang")
g.add_node("C++", category="lang")

g.add_node("js", label="John Smith", category="people")
g.add_edge("js", "PHP")
g.add_edge("js", "C++")

g.add_node("ms", label="Martha Stewart", category="people")
g.add_edge("ms", "PHP")

I would like to have a cluster for the category people. so that people in the graph would be centralized.

I started by creating nodes by categories, but the issue is that it adds visible noise. If I could "hide the category node" that could be a part of the solution. Except if someone has a better idea.