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