graphviz 2.28 Voronoi-based technique

 I used graphviz neato 2.26 with overlap = false option and had graph the way i wanted it to be. But now i've upgraded to 2.28 and the graph is totally messed up.

The reference says: If Prism is not available, or the version of Graphviz is earlier than 2.28, "overlap=false" uses a Voronoi-based technique.
So my question is: can i still use Voronoi-based technique in 2.28 and how? (I can not downgrade to 2.26).

 

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