The Toffees have not lost in their last five Premier League visits to the Southwest London venue and the Australian international wants them to harness those past performances this weekend to help get the season back on track.
"When we are up against it we seem to shine a bit and try and fight our way out of a corner - the main thing for us is to keep the unity and keep the strength on the pitch," Cahill told the club's official website.
"We need to have the determination and grit to go to a place like Chelsea and get the right result.
"We know they've been banging in the goals left, right and centre but we need to focus on our strengths.
"Past performances count for nothing and it's about how we apply ourselves in this game.
"It's exciting - Chelsea are one of the biggest teams in the country if not the world and for us it's a great challenge to go there and put in a great performance."