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