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