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