raster to graph

Help formatting the graph layout

Hi, 
I am trying to display a graph which is actually a representation of a raster or uniform grid. So I need the edges to be straight and the graph to look like a mesh/grid really. At the moment I am getting a compact format but not as intuitive as having a nice straightforward grid format. Can someone please help?
Attached are the svg/pdf and dot .
 
Thanks,
Ed
 
 

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