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