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