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