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