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