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