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