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