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