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)(13,20)(14,16)(15,17)(18,25)(19,23)(21,24)(22,26) involution — undirected(7,8)(9,10)(12,16)(13,21)(14,23)(17,19)(20,26)(22,25) involution — undirected(4,6)(8,10)(12,17)(16,19)(18,24)(20,26) involution — undirected(4,6)(11,13,14,21,15,22,23,25)(12,18,19,26,17,24,16,20)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.