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