One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,8,5,7,9,15)(3,6,11,13,10,14,12,16)(17,18)(19,22,26,30)(20,27,28,23)(21,24)(25,29)(31,32)(1,3,9,11,5,10,4,12)(2,6,8,16,7,14,15,13)(17,19,21,26)(18,22)(20,25,28,31)(23,29)(24,30)(27,32)(17,20)(18,23)(19,25)(21,28)(22,29)(24,27)(26,31)(30,32) involution — undirected(18,24)(22,30)(23,27)(29,32) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.