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