Series switches display
You could put a resistor and a LED wired in series and together in parallel with each switch. This will mean that if a switch opens, a small current will flow through the resistor, the LED, the closed switches and then thru the motor. The problem might be that the small current (say 20mA) might still cause the motor to move a little especially if it's a small 48 volt type.

If you can live with this and the supply is DC and always polarized the same way (i.e. not an output from a H bridge) then it should work.

If it's an AC motor then an extra diode is needed in parallel with each LED to prevent reverse bias.