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