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)(11,13)(12,16)(14,15)(17,18,22,25)(19,23,26,21)(20,24,28,32)(27,31,29,30)(3,8)(6,7)(10,15)(11,16)(17,19)(18,23)(20,27)(21,25)(22,26)(24,31)(28,29)(30,32) involution — undirected(1,3,5,8)(2,6,4,7)(9,11,14,16)(10,12,15,13)(19,26)(20,28)(21,23)(24,32)(3,8)(6,7)(9,12,14,13)(10,11,15,16)(17,19)(18,23)(20,29)(21,25)(22,26)(24,30)(27,28)(31,32)(1,3)(2,7)(4,6)(5,8)(9,10)(11,12)(13,16)(14,15)(17,20)(18,24)(19,27)(21,30)(22,28)(23,31)(25,32)(26,29) involution — undirected(1,4,5,2)(3,6,8,7)(9,13,14,12)(10,16,15,11)(17,21,22,23)(18,19,25,26)(20,30,28,31)(24,27,32,29)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.