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