There are many ways to visualize the spatial domain of WRF. I have used several of them in my previous papers, but they turned out to be not so elegant for publications. Therefore, while writing the dissertation recently, I developed some functions that can directly digest WPS namelist (rather than WRF output in some cases) to derive the domain boundaries. Figure 1 is an example plot.
Figure 1. Visualization of WRF domain from home-made Python. Background is the topography from ETOPO1 dataset.