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