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