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