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