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