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