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