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