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