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