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