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