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