I'm going to make a suggestion here. That you pay Hayward installer to install the used PLPS8 on your pool. I have no doubts you can do it yourself. But there are several reasons to punt here.
First the Hayard installation manual is here:
https://www.hayward-pool.com/pdf/manuals/PLTPM-PL-PS-x&PL-PS-x-VInstallationOct08&Later.pdf And the Operating manual is here:
https://www.hayward-pool.com/pdf/manuals/PLTPM-PL-PS-x&PL-PS-x-VOperationsOct08&Later.pdf
Pool equipment manufactures systems are not very installer friendly and poorly documented. Many of the most efficient ways to do things, especially in larger systems require short cuts and tricks not found in the manuals but taught at the manufacturer's seminars for their dealers. To do this you are not only going to have to figure out the wiring logic but also the programming logic for the system. I'm not saying you can't do it but I don't think it is really worth the effort.
Second, all pool systems are different. Yours with 4 pumps is especially complex. I have doubts that a picture on the wiring of someone's similar system will be that helpful unless it is fully annotated. I'm all for plagiarism. I copy every day. But because pools, even similar ones have subtle differences that can make copying ineffective.
Now, that said, I have included a copy of the manuals for this above. The manual is actually somewhat good and includes an example of a complex system. I'd study the installation manual and get a understanding of the system first. Auto control of 4 pumps and their associated functions can be complicated and wiring is often the simple part of the process.
Lets see if anyone responds with pictures but there are not that many pools with 4 pumps on that automation so I have my doubts.
I bet you could even find a guy that works for a Hayward PB to install it for you under the table for a relatively cheap price. Cash does wonderful things.
Good luck and have fun.