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