You can print the entire return as usual to PDF for your client to review and that will include the F.8879.  If you need only the F.8879 (assuming you have already provided your client the return for review separately), you can partial print to PDF just the F.8879.

Electronic signature comes in many forms.  If your client doesn't use e-Signature from DocuSign, you can always have your client return the copy signed in wet ink to you by fax, encrypted email, or via Intuit Link.  Otherwise, it can be signed in person.