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