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