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