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