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