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