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