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