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