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