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