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