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)(11,13)(12,14)(15,16)(18,23)(19,26)(24,29)(27,32) involution — undirected(2,6)(7,8)(9,11,12,15)(10,13,14,16)(18,24)(19,26)(20,28)(22,31)(23,29)(25,30)(1,3,5,4)(2,7,6,8)(10,14)(13,16)(17,18,21,23)(19,20,26,30)(22,29,31,24)(25,27,28,32)(1,3,5,4)(2,7,6,8)(17,19,21,26)(18,25,23,28)(20,29,30,24)(22,32,31,27)(1,4,5,3)(2,8,6,7)(17,20)(18,26)(19,23)(21,30)(22,28)(24,27)(25,31)(29,32)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.