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