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