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