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