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