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