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