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