I don't think there is a specific color that has generally been declared as the "color of AI".
However, when choosing a color for something, it usually is a good idea to take a step back and think about what the specific term you are trying to visualize represents and pick colors that represent these values the best.
AI is a term that is largely perceived as being:
but also as being:
Based on this you could choose:
Turquoise or blue. They are likely the most prominent color when it comes to visualizing forward-thinking, communicative and technological concepts. They also represent a sense of security, that might be what you are looking for, as new technologies can be scary, especially when it comes to self-learning computers, that have been hypothesized to being the end of humanity. Likely or not, you will probably not want your logo/icon/brand to represent the downfall of humanity.
Orange. Orange might not feel as futuristic or technological as the previously mentioned colors, but it is a very dynamic, lively young and also communicative color. Neural networks are everchanging and -adapting and can provide many possibilities for the future. AI is based on the concept of finding new connections and learning through them. Orange is a viable choice that can represent all of these things. It also gets rid of the cold and frightening vibe that the concept of AI might radiate to some people and is not being used in a technological context that often, which can make you stand out more easily.
...or something completely different. You might have a different focus on which part of AI you want to stand out the most. The only thing that is important is that the color you are choosing fits to the aspects you have picked to be most relevant.
Another thing worth mentioning might be to use brighter background colors rather than darker ones. Having a black background for instance would enhance the negative associations towards AI, while a white one can give the concept an entirely different optimistic outlook.