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