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