Hello. I am trying to find a module using WGCNA and visualize the module network.

What I'm curious about is that I don't know how to find the correlation between "genes" that make up a module. Weight also represents correlation in terms of co-occurences(or co-expression), but it always has a positive value, so I wonder how to find a relationship between genes, which negatively correlated.

Finally I want to draw Networks having edges, Red representing Negative correlation and Blue showing Positive correlation. I am stucked with this so long times. Please help me.

I appreciate your comments.