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