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