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