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