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