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