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