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