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