Oi eu tento desenhar polilinhas com direções waypoints no google maps.

Eu tentei algo assim.Meu desenho Quero desenhar as rotas com cores diferentes como esta.

Exemplo de direções ss do Google Maps

Eu escrevi este código de exemplo.

 function initMap() {
    var directionsService = new google.maps.DirectionsService;
    var directionsDisplay = new google.maps.DirectionsRenderer;
    var map = new google.maps.Map(document.getElementById('map'), {
      zoom: 6,
      center: {lat: 41.85, lng: -87.65}
    });
    directionsDisplay.setMap(map);
    calculateAndDisplayRoute(directionsService, directionsDisplay);
  }

  function calculateAndDisplayRoute(directionsService, directionsDisplay) {
    var waypts = [
          {
            location: '41.062317, 28.899756',
            stopover: true
          },
          {
            location: '41.062276, 28.898866',
            stopover: true
          },
          {
            location: '41.061993, 28.8982',
            stopover: true
          }
        ];
    directionsService.route({
      origin: {lat: 41.063328, lng:28.901215},
      destination:{lat: 41.060756, lng:28.900046},
      waypoints: waypts,
      optimizeWaypoints: true,
      travelMode: google.maps.TravelMode.DRIVING
    }, function(response, status) {
      if (status === google.maps.DirectionsStatus.OK) {
        directionsDisplay.setOptions({
          directions :response,
        })
        drawpolylines(directionsDisplay.getMap())
        var route = response.routes[0];

      } else {
        window.alert('Directions request failed due to ' + status);
      }
    });

  }

  function drawpolylines(map) {
     var flightPlanCoordinates = [
      {lat: 41.062317, lng: 28.899756},
      {lat: 41.062276, lng: 28.898866},
    ];
    var flightPath = new google.maps.Polyline({
      path: flightPlanCoordinates,
      geodesic: true,
      strokeColor: '#FF0000',
      strokeOpacity: 1.0,
      strokeWeight: 2
    });

    flightPath.setMap(map);
  }