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