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