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)(20,28)(21,22)(24,29)(25,26)(27,31)(30,32)(1,3,6,5)(2,4,7,8)(9,10)(11,14)(12,15)(13,16)(17,18)(19,25)(20,24)(21,22)(23,26)(27,31)(28,29)(30,32)(2,7)(4,8)(18,22)(19,26)(24,28)(27,32) involution — undirected(1,4,6,8)(2,3,7,5)(9,11,13,12)(10,14,16,15)(17,18)(19,23)(20,24)(21,22)(25,26)(27,30)(28,29)(31,32)(9,11,13,12)(10,14,16,15)(17,19,21,26)(18,23,22,25)(20,27,29,32)(24,30,28,31)(1,5,6,3)(2,8,7,4)(9,12,13,11)(10,15,16,14)(17,20,21,29)(18,24,22,28)(19,27,26,32)(23,30,25,31)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.