One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,12,14)(11,15,16,13)(17,18)(19,26)(20,24)(21,23)(22,25)(27,28)(29,31)(30,32)(9,11)(10,13)(12,16)(14,15)(18,23)(19,27)(20,28)(22,29)(24,32)(26,30) involution — undirected(2,5)(6,8)(10,14)(11,16)(17,19,22,27,21,24,29,32)(18,20,25,30,23,26,31,28)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(18,23)(20,26)(25,31)(28,30)(17,20,29,28,21,26,22,30)(18,24,31,27,23,19,25,32)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.