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)(11,16)(12,14)(13,15)(17,18,20,23)(19,22,26,31)(21,24,28,32)(25,30,27,29)(1,3)(2,5)(4,8)(6,7)(17,19)(18,22)(20,26)(21,25)(23,31)(24,30)(27,28)(29,32) involution — undirected(9,11,13,12)(10,14,15,16)(18,23)(19,25)(21,28)(22,29)(26,27)(30,31)(2,6)(5,7) involution — undirected(3,8)(5,7)(9,12,13,11)(10,14,15,16)(19,25)(21,28)(22,30)(24,32)(26,27)(29,31)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.