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