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