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