Hi
You can use the Unity LineRenderer to draw lines. It should be relatively straight forward to get the path on the callback and then simply assign the points to a LineRenderer.
If you have the pro version, the example scene PathTypes does just that.
Something like this:
public void OnPathComplete (Path p) { List<Vector3> path = p.vectorPath; lineRenderer.SetVertexCount (path.Count); for (int i=0;i<path.Count;i++) lineRenderer.SetPosition (i, path[i]); }