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