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