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