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