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