  We examine the contribution of the pion cloud to the electromagnetic $N
\rightarrow \Delta$ transition form factors within a relativistic hybrid
constituent-quark model. In this model baryons consist not only of the $3q$
valence component, but contain, in addition, a $3 q \pi$ non-valence component.
We start with constituent quarks which are subject to a scalar, isoscalar
confining force. This leads to an $SU(6)$ spin-flavor symmetric spectrum with
degenerate nucleon and Delta masses. Mass splitting is caused by pions which
are assumed to couple directly to the quarks. The point-form of relativistic
quantum mechanics is employed to achieve a relativistically invariant
description of this system. The $N \rightarrow \Delta$ transition current is
then determined from the one-photon exchange contribution to the $\Delta$
electroproduction amplitude. We will give predictions for the ratios $R_{EM}$
and $R_{SM}$ of electric to magnetic and Coulomb to magnetic form factors,
which are supposed to be most sensitive to pion-cloud effects.
