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