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)(11,12,15,19,16,20,26,18)(13,17,21,25,23,14,22,24)(3,5,7,4)(6,9,10,8)(11,13)(12,17)(14,20)(15,21)(16,23)(18,24)(19,25)(22,26)(3,6,7,10)(4,8,5,9)(12,18)(13,21)(15,26)(19,20)(22,23)(24,25)(4,5)(8,9)(11,14,16,17)(12,13,20,23)(15,25,26,24)(18,21,19,22)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.