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All VISO ontology modules can be downloaded from GitHub.
You may also directly retrieve the ontology (modules) from their URI, which is dereferencable and will return the ontology as application/x-turtle if you do not explicitly request text/html (which will show you the documentation).
So opening http://purl.org/viso/graphic/ with a browser will show you the documentation, while requesting
curl -L http://purl.org/viso/graphic/ -H "Accept: application/x-turtle"
will give you the ontology in turtle serialization instead. Let us know about any problems you may experience accessing the ontology with other user agents.