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Electric field (E) is defined as the physical field surrounding electrically charged particles and which exerts force on all the other charged particles within the field by either attracting or repelling them.

Electric field can be deduced using Gauss's law, particularly for the ones that have high degree of symmetry from the shape of charge distribution.

The pattern of the electric field is somewhat similar to the shape of the charged body we have if the gaussian surface matches the symmetry of the charge dispersion that is inside.

Here the shape of the electric field is cubical in nature and therefore the electric field at each point on the face is comparative and its direction is perpendicular to the face cube.

The sketch therefore is:

Yes we can deduce the shape of the cube’s electric field by using symmetry alone. Herein, the electric field in each face of the cube will have same magnitude and perpendicular to that face.