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