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