Drawing, interpreting or calculating from inverse square law graphs are common exam questions - there are lots of similarities between gravitational and electric field graphs:
Graphs of field strength against distance should start off steeper and decrease rapidly compared to that of potential graphs against distance, to distinguish it as an inverse square law (1/r2) relation instead of just an inverse relation (1/r)
There are plenty of differences too:
For example, gravitational potential always increases with respect to distance whereas electric potential can increase or decrease
One way to remember whether the electric potential increases or decreases with respect to the distance from the charge is by the direction of the electric field lines - the potential always decreases in the same direction as the field lines and vice versa.