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