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