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