Question on ploting a graph

Hi, I have a dataset that has nodes and distance between them. For example:

Node1 Node2 Distance  
  1    2     65
  2    4     45

The distance between node 1 and node 2 is 65.

I wanted to plot a network graph with these nodes and there distances. This problem is hard because it has no x,y coordinates. Please help! Is there any package that I can use , I know graphviz is a great to generate network graph...is there anything similar to that in matlab?