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