Chelsea have already got off to a far better start to this season under Conte, who has won his first four matches in charge.
Speaking to BBC Five Live, Cahill reveals how the Italian has united the dressing room once again.
He said: "We needed organisation. Everyone saw what happened. We went from winning the league having stayed at the top all year to the disaster of last season. We lost our way tactically, everyone's head was in different directions.
"When I say about pulling together as a team, I felt everyone had different situations going on individually whether that be if you're playing or not, the manager, or this or that. Different distractions are never healthy.
"It is the hardest thing [when everyone is not on the same wavelength]. People talk about as if you wake up one day and suddenly you're a bog standard player. It doesn't happen.
"You always have the quality and ability, it's the mindset, everyone being fully focused on what they're doing, no distractions.
"This season we have come in, worked very hard and we are buying into what is happening here. That's the most important thing to move forward."