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)(11,12,16,19)(13,17,15,24)(14,21,22,26)(18,20,25,23)(3,5)(4,7)(6,10)(8,9)(11,13,16,15)(12,17,19,24)(14,20,22,23)(18,21,25,26)(11,14,13,20,16,22,15,23)(12,18,24,26,19,25,17,21)(5,10)(7,9)(11,13,16,15)(12,17,19,24)(14,20,22,23)(18,21,25,26)(4,8)(7,9)(14,22)(18,25)(20,23)(21,26) 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.