Normally when you plot the k-point resolved transmission, it becomes a square plot of T vs kA and kB (the actual point K=kA*b1+kB*b2 where b1,2 are the reciprocal lattice vectors), because that is how we sample the Brillouin zone.
In the hexagonal case, it is more illustrative to see the plot in the actual Brillouin zone, i.e. as a function of kx,ky in the hexagon. To make that plot is rather challenging because as it turns out, the Monkhorst-Pack regular grid in kA,kB space actually samples points in the 2nd Brillouin zone, which you then have to map back into the first zone. And, there are some tricks needed in matplotlib to get a hexagonal axis plot. But in the end, you can get the attached picture!
The labels K and M have been added afterwards in an image editing program.
The inspiration for this came from PRB 80, 035408 (2009)