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