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)(20,27,28,23)(21,24)(25,29,31,32)(26,30)(1,3,9,11,5,10,4,12)(2,6,8,16,7,14,15,13)(17,19)(18,22)(20,25)(21,26)(23,29)(24,30)(27,32)(28,31)(17,20,21,28)(18,23,24,27)(19,25,26,31)(22,29,30,32)(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.