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