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