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