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