Click on Contacts under your Vendor list to bring up your Contacts. Check the box next to Name to select all, or check the Contacts you want from your list.
If you have a large group of Vendor Contacts, you can filter by tags or other options to refine your list as necessary using the Action Pane off to the right, then click on the Download option up in the upper right-hand corner of your Contacts page.
Your data will be exported out into an Excel spreadsheet for you to size, edit and print out as necessary.