Issue regarding getting intermediate node locations in a Data Flow Graph

I have written a global data flow graph logic, for which I am getting the source and sink results and hence their locations as well. But I am interested in the nodes of the data flow graph as well and need their location so that I can reorder the final results in a certain format. How can I get the location of the nodes of a data flow graph?

Would be really grateful if someone throws some insight here. Let me know if you need any other input from me.