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