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