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