  A tight-binding model with randomly fluctuating atomic positions is studied
to discuss the effect of strong disorder in graphene. We employ a
strong-disorder expansion for the transport quantities and find a diffusive
behavior, where the conductivity is decreasing with increasing disorder.
Surprisingly, the magnetic field drops out of the transport quantities in
leading order of this expansion. This signals a strong suppression of
magnetotransport effects for sufficiently strong disorder. This result is
consistent with recent experimental observations by Morozov {\it et al.}
