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