Wow...
72 plots...
Can you even see anything?
You can change a plot's color (and other properties) by creating a property node for the graph. Then, you use the property node to select the active plot (you can do this in a loop to handle many plots) and set the plot's property.
To create a property node, right click on the control or the terminal and select Create>>Property Node. Then, select the property Active Plot and select another property (like Plot>Color) and write the value in.
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