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