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