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