|   | 1 |  initial version  | 
You will need to use the plot method to be able to save, as the show method returns None. Say G is a Graph. Then the following saves a picture of G to filename.png.
sage: p = G.plot()
sage: p.save('filename.png')
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.