Change the color of dimensions in Map

I have two dimensions in my looker view file like this:
 

dimension: start_location {
    type: location
    sql_latitude: ${TABLE}.start_lat ;;
    sql_longitude: ${TABLE}.start_lng ;;
  }

  dimension: end_location {
    type: location
    sql_latitude: ${TABLE}.end_lat ;;
    sql_longitude: ${TABLE}.end_lng ;;
  }

I want to show these two points on map by different colours, one for start point and other for end point.