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