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