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