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