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