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