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