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