You can put the graph as a seperate document tab (opposed to inside a sheet). Then you can print it to PDF, using either some installed PDF printer or the Office built-in PDF printer. Then you can include the graph using the package graphicx and the command \includegraphics[width=\linewidth]{graph.pdf}.
You can as well download the TeX fonts as OTF and use them in Office, achieving the font consistency. The basic Computer Modern can be gotten here in the renewed version Latin Modern:
Far from perfection, but for a document with a single table you can use detex and then replace & by , and delete empty lines. In Linux you can use some tools as grep and sed for this. The first line of the table is then the columns types, so you can delete manually or with some tool like tail. Example command line:
Best Answer
In Excel select the graph you want and save it as a pdf. Crop it with
pdfcropand include it in your TeX document with\includegraphics.