The 31-year-old believes the Scot has been the driving force behind Everton's run of six top-seven finishes in the past eight seasons.
"Moyesy has been very loyal to the club and I think I have learned a lot from him over the years," Cahill told the Liverpool Daily Post.
"He is always there and is a constant source of motivation for the lads - especially when things are not going so well.
"He is always honest with the players and I think this has been important for us, as a team, in recent seasons.
"We have a great group of players at the club and I think this is largely down to the work of the boss - he has made some great signings and we all have a great understanding of each other which helps massively when you are trying to win matches."