What does a ladder diagram for a flashlight look like?

In North America the diagram will have a left and right supply rail. The rungs are between these rails in a horizontal position. Usually the voltage supply is on the left and return to source is on the right. The rung will consist of a switch in series with a lamp drawn from the left rail to the right rail. That's it.

In European countries the rails are top to bottom. The rungs are between these rails in a vertical position. Usually the voltage supply is on the top rail and the return to source is on the bottom rail. The rung will consist of a switch in series with a lamp drawn from the top rail to the bottom rail.