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