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