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