Last month the Logos blog provided a set of six sentence diagrams for Galatians done by Terry Cook. If you use Logos they are well worth downloading and having a look at. Cook spent a lot of time on this and includes grammatical notes from some major grammars. Jump over the link and download the zip file.
Cook followed the divisions of NA27 rather than chapter breaks:
If you have trouble installing them read the blog comments for some additional instruction.