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