This project contains an almost readable graphical representation of the Eclipse Sirius Diagrams.
They were extracted from Eclipse Sirius version 6.3.1.202006101101.
To quickly see the diagrams, just look at the png files in the pics folder. Otherwise, import the whole project in an eclipse modeling as an "Existing project" and open the representation files to see the diagrams interactively.
More information about the metamodels' structure can be found here.