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