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