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