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