From what I can see, there is not an option to export a Power View visualization from within Excel 2013. When you select the "Save As" menu option, there are numerous formats, but PowerPoint is not one of them.
One way I can think of to get the Power View visualization into a PDF is to use a "PDF Printer" program, which acts as a system printer and can convert anything you can print into a PDF. There are a number of freeware and shareware PDF Printer softwares available for testing.