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