private String encodeColor(Color color) {
		if (color == null) {
			return encodeColor(FunctionGraphOptions.DEFAULT_GROUP_BACKGROUND_COLOR);
		}

		int rgb = color.getRGB();
		return Integer.toString(rgb);
	}
Note: this class should be created along with a GroupedFunctionGraphVertex, as the info
needed by this class is still available then.  To create this class later will result in
missing information (for example, edges get removed when vertices are grouped and this info
object will collect edge information, but cannot do so if they have been removed from the 
graph).
Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/GroupedVertexInfo.java