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)(19,26,24,20)(22,25,30,32)(27,28,31,29)(10,13)(11,16)(18,23)(19,27)(20,28)(22,30)(24,31)(26,29) involution — undirected(2,5)(6,8)(9,11,12,16)(10,14,13,15)(17,19)(18,20)(21,24)(22,31)(23,26)(25,28)(27,30)(29,32)(1,3,4,7)(2,6,5,8)(10,13)(14,15)(18,23)(20,26)(25,32)(28,29)(17,20,21,26)(18,24,23,19)(22,28,30,29)(25,27,32,31)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.