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