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