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