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