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