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