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