One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(9,10)(11,13)(12,15)(14,16)(17,18)(19,26)(20,21)(22,23)(24,29)(25,31)(27,32)(28,30) involution — undirected(5,6,7,8)(12,16)(14,15)(18,23)(21,31)(24,26)(28,32)(5,6)(7,8)(10,11)(14,15)(17,19)(18,24)(20,30)(21,32)(22,29)(23,26)(25,27)(28,31) involution — undirected(1,2)(3,4)(9,11,13,10)(12,15,16,14)(17,20)(18,21)(19,27)(22,25)(23,31)(24,28)(26,32)(29,30)(9,12)(10,14)(11,15)(13,16)(17,21)(18,25)(19,28)(20,23)(22,31)(24,30)(26,27)(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.