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