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