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