One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,8)(5,7)(6,10)(11,15)(12,14)(13,16) involution — undirected(1,3)(2,6)(4,11)(5,10)(7,9)(8,13)(12,16)(14,15) involution — undirected(3,10)(6,9)(11,16)(13,15) involution — undirected(2,7)(6,9)(8,14)(13,15) involution — undirected(1,4,5,12)(2,8,7,14)(3,11,10,16)(6,13,9,15)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.