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