Hi,
This is not currently possible - if the user has access to view the process, then it will be possible to see all the contents of the process definition, including the Flow Chart and the other contents.
If you want to only share the Flow Chart with users, then I'd probably recommend you to take screenshots of the flow charts of the processes, then add them separately to object instances as attachments or add all of them to one DOC/PPT document and make it available to those users for their reference.
If you want the users to see the Process, not in Administration - Processes - Available but on another page - then there is the Home - Organizer - Processes page that contains a list of the executing processes and they can click on Process Flow Diagram to see the Flow.
I hope this helps -Nika