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