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