I would be very surprised to see Griezmann playing as a winger. I know Valverde sucks, but I don't see the club buying one of the 2 or 3 best CF in the world to play him on the wing. Especially for that price, and especially when paying his clause has been such a drama. People might argue that something similar happened for Coutinho, but Coutinho was nowhere near AG when he was bought honestly. He never was a serious contender for BO for example, while Griezmann was top 5 twice in the past 3 years. They're simply not on the same level.
Anyway, Griezmann works best when he's right behind another striker, so I'd say we might see a 4-2-3-1 with a front three Dembele-Griezmann-Messi behind Suarez. Who would be the 2 midfielders, among FDJ, Busi, Arthur, Raki, Vidal and the rest is a bit of a mystery to me and the answer will probably depend on the opponent.
Others options include benching Suarez, or a 4-3-1-2 with Messi behind Suarez and Griezmann (which means Dembouz on the bench though).
Honestly, there are quite a few interesting possibilities, and the team could be very versatile. The problem is that the choice between those possibilities will be in the hand of a rather bad coach.