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)(11,13)(12,15)(14,16)(17,18,22,26)(19,21,25,23)(20,24,28,31)(27,29,32,30)(2,6)(4,7)(10,11)(14,15)(20,28)(24,31)(27,32)(29,30) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,10,13,11)(12,14,16,15)(17,19,22,25)(18,23,26,21)(20,27,28,32)(24,30,31,29)(1,4)(2,3)(5,7)(6,8)(9,11,13,10)(12,15,16,14)(17,20,22,28)(18,24,26,31)(19,27,25,32)(21,29,23,30)(1,4)(2,3)(5,7)(6,8)(9,12,13,16)(10,14,11,15)(17,18)(19,23)(20,24)(21,25)(22,26)(27,30)(28,31)(29,32)(1,3)(2,4)(5,8)(6,7)(17,21,22,23)(18,25,26,19)(20,29,28,30)(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.