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