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