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