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