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