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