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