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