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