Diagrams of the Energy Centers, as well as a detailed description of these centers, can be found in Dr. Joe’s Book Becoming Supernatural, Chapter 4.
If you have an Instagram account, you will find an excellent description of The Energy Centers.
You can also see a video visual by viewing the Introduction to the Progressive Workshop YouTube Video.
In addition, in the Blessing of the Energy Centers 1 Meditation, there is an excellent description of the Energy Centers. The links to the book and video are below: