One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(10,13)(11,14)(15,16)(19,28)(20,21)(23,31)(24,32)(25,26)(29,30) involution — undirected(2,5)(6,8)(9,10,12,13)(11,14,15,16)(17,18)(19,23)(20,25)(21,26)(22,27)(24,29)(28,31)(30,32)(1,3,4,7)(2,6,5,8)(9,11,12,15)(10,14,13,16)(17,19)(18,23)(20,30)(21,28)(22,29)(24,27)(25,32)(26,31)(9,11,12,15)(10,14,13,16)(17,19)(18,24)(20,28)(21,30)(22,29)(23,27)(25,32)(26,31)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.