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