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