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