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