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