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