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