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