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