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