One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(9,10,12,14)(11,13,15,16)(17,18,22,26,21,24,23,31)(19,27,28,32,20,29,30,25)(1,2,4,5)(3,6,7,8)(9,11,12,15)(10,13,14,16)(18,24)(25,32)(26,31)(27,29)(3,7)(6,8)(11,15)(13,16)(17,19)(18,25)(20,21)(22,30)(23,28)(24,32)(26,29)(27,31) involution — undirected(1,3,4,7)(2,6,5,8)(17,20,21,19)(18,25,24,32)(22,30,23,28)(26,27,31,29)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.