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)(12,16)(13,15)(20,27)(24,31)(26,28)(30,32) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,15,16)(18,23)(19,21)(20,26)(25,29)(27,28)(30,32)(10,15)(14,16)(17,18,22,25)(19,23,21,29)(20,24,27,31)(26,30,28,32)(2,6)(5,7)(17,19,22,21)(18,23,25,29)(20,28,27,26)(24,32,31,30)(3,8)(5,7)(9,12,13,11)(10,16,15,14)(17,20)(18,24)(19,26)(21,28)(22,27)(23,30)(25,31)(29,32)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.