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