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)(11,14)(12,15)(13,16)(17,18,21,25,22,20,26,24)(19,23,28,31,27,29,32,30)(2,5)(3,7)(9,11,13,12)(10,14,16,15)(17,19,26,32,22,27,21,28)(18,23,24,30,20,29,25,31)(1,3,4,7)(2,6,5,8)(10,15)(11,12)(14,16)(17,20)(18,22)(19,23)(21,24)(25,26)(27,29)(28,31)(30,32)(2,5)(6,8)(18,20)(19,27)(24,25)(28,32) 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.