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