I've never been one for wiring diagrams, I just built a table of the pins as I connected them which is a few pages now. See the attached screen dump.
But Norbert on the Linuxcnc forum shared a connection sheet for the Mesa 7i76e which I am sure you will find pretty amazing if you are used to the limited pins on a ESS board. PDF file is attached. Norbert is the author of the gmoccappy touch screen GUI for Linuxcnc which I use.
Take the time to study how many different types of hardware that can be connected. as well as the additional expansion builtin.