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