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