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