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