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