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