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