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