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