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