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