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