Answer
The center of the diffraction pattern is located to the left.
Work Step by Step
The angle (as measured from the center) where the light appears is proportional to the wavelength.
That is: $~~\theta \propto \lambda$
Since red light has a longer wavelength than blue light, the red light must be a greater angle from the center of the diffraction pattern.
Therefore, the center of the diffraction pattern is located to the left.
