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