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