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