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