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