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