When you play Liverpool you're often at your most weak when you have the ball. They swarm you and then hit you with pace. The only weak point they have is that one of their CBs (Lovren) doesn't like turning and they also struggle to break teams down who don't think give them space in behind.
With this in mind, I would play a very, very deep back four. Keep a strong shape, let Liverpool have the ball (not that we'll have much choice) and look to hit them on the break via the channels. Long balls over the top to get them running back at goal.
Team:
Pickford
Holgate Keane Mina
Sidibie schneiderlin Digne
Davies Iwobi
DCL Richarlison
keep it compact, practically able to get man to man and ask DCL and Richarlison to run into the channels after the long balls.
if you try and play against these, you get smashed.