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