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