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