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