Visualising a Raster (KAP open sea map file) using python with rasterio how do I get the colours correct

I have just started using rasterio to show raster maps in Python. I want to display some OpenSeaMap (KAP raster format). I have started with a single kap file, I can load and display a single kap file. However, the colours are not what I want. My code is below.
`

import rasterio
from rasterio.plot import show
src = rasterio.open("L10-296-560-8-24_10.kap",cmap='')   
show(src)

`
This displays

But what I want is

Does anyone know how I tweek the colormap to get to what I want? Or maybe I should be using a different python library.