One of the style options of a net is the color scheme of the node-sets within the net.
Default Node Colors:
Decision Nodes: blue
Nature Nodes: beige
Utility Nodes: pink
Note/Text Nodes: light blue
How to: To produce
a node-set properties dialog box
and arrange the node-set colors to produce the desired visual effect,
choose Style →
Colors,
or right-click
on the net and choose Modify
→ Nodeset
Properties. More Info