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