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