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