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both grounding the motor and using shielded cable will help, the first measure may be more effective.
pulling out the cable totally and keeping most of it as far as possible away will of course also reduce the electric and magnetic fields where you are.
if the cable is coiled up in the vacuum cleaner, it is too close and this coil will produce magnetic fields in addition from those from the motor and the cable.
most of the magnetic field likely comes from the motor, the rest from the cable when a current runs and from an eventual coil.
by the way, any plugged in cable, also when nothing runs, emanates an electric field.
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