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