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