Different colours for gpx and routes on a map

I am geocoding from a gpx file using this module and then putting it on to a leaflet map.

Every gpx route on the map is shown in blue, how to change the colour of each separate gpx route?

Every route is blue so those that overlap or are near each other are hard to differentiate.

This is possible with geolocation module but can't seem to work it out with geofield module.