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