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