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