Your formula is ok ( central force = m .r .omega^2 where omega is angular frequency)

You can plot what you like against what you like.

Normally, when graphing something, you keep all but one of the input variables constant - it gives a more sensible picture of the relationships involved.

so, for example-

keeping the angular frequency constant, the force would be proportional to the radius (straight line)

or

keeping the radius constant, the force would be proportional to the angular velocity squared (parabola)

If this is homework, to be handed in, don't forget to label the axes and write the formula in your title - be a good student!!