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