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