Network Graph : get Nodes inside the network graph and not on Edges

Hello guys,

I am looking to create a network Graph that shows # of feedback exchanged in a Team.
Big circles represent people who received lots of feedback.

These Big Circles appear on the edge while they should be logically rather located in the center of the graph as these people are Nodes.

What should I do to get Popular Nodes in the center and more isolated nodes on the edge.
(not looking to Hardcode position).