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