Google Visualization Api does not provide an api to print them. One way is to convert your codes to Google chart api which renders images.
The other way is to use the following:
Website Thumb Generator can be used to create website thumbnails for your needs, or start your own website thumbnail generation service.
PHP GD library (installed on most hostings)
Permissions to execute third-party applications (i.e. exe files)
Permissions to execute Internet Explorer
How it works:
Website Thumbnail Generator checks if it already has website image in the cache, and shows it in the browser.
If no cached image then IECapt would be run from the script.
IECapt would run Internet Explorer, grab full sized website screenshot from it, and save image into the folder you specified in script settings.
Then Website Thumbnail Generator would resize image, and show it in the browser.
Download IECapt from http://iecapt.sourceforge.net Place it in some folder on your server.
Download Website Thumbnail Generator using link below, and unzip it to the same folder.
Update webthumb.php with your settings for thumbnails folder, cache time, default thumbnail size, etc.
Website Thumbnail Generator