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