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