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