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