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