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