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