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