I have an easy Mac solution, for those (like me) who are still searching this question and come upon this old thread.
1. Copy the graph in JMP (either the one you've created in Graph Builder or from any analytical output)
2. Open Preveiw (Apple's built in PDF & image viewer).
3. Open a new Preview window (File > New from Clipboard, or use the shorcut ⌘N).
4. Next, choose File > Export
5. Choose your preferred format (options are HEIC, JPEG, JPEG-2000, OpenEXR, PDF, PNG, TIFF as of Sept 2019)
6. You can adjust the quality and/or resolution for all but PDF formats.
Even though this is an old thread, I still had this question this morning (Sept 2019), so I hope this helps other Mac users out there!