I think you are approaching this from the wrong angle.
The color of the Aura is dependent on the energies that are dominant within a person, and a Spiritual Satanic practitioner can influence this and literally program this as they like through these meditations on specific wavelengths (colors) of energy.
People do not have any set color to their aura as part of an identity or anything, whatever color they have is simply the result of energies present in them or lacking in them.
This changes easily depending on circumstances, such as emotions, external circumstances, influences from other people, thoughts, things like illness or internal struggles, as well as the individuals natural tendencies.
For regular people, they have no control over this as they do not know even that they have an Aura. For an SS, the aura will be how you make it be.