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