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