After scoring in victory over Bournemouth, Salah has 70 goals in 100 Premier League matches for the club.
Murphy told talkSPORT: "Mo Salah is a unique player. Scoring so many goals so quickly from that outer position is sensational. Comparing him with strikers is difficult because he does not play centrally, but achieving what he has done so quickly from the edge is a better performance than any of Liverpool's strikers have done.
"He has probably been Liverpool's best buy for the last ten years. I know Luis Suarez was sensational, but Salah's continuity and durability, he rarely misses matches. And he is so unassuming, he does his job under the radar. He does not flash, he does not do stupid provocative goal celebrations, he just continues to knock in goals."