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