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