The Center for Immigration Studies released a study in 2009 which makes the claim given in the question. Its claim was misquoted (as 57/76 instead of 57% of 76):
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It gives the source as the FBI Most Wanted For Murders List.
The CIS study further stated that an overwhelming majority (35/43) of them were Mexican.
Assuming that the list has not changed significantly in composition since 2009, we can directly fact-check this list to verify this claim. A cursory sample of the wanted criminals listed shows that indeed a significant proportion of them are foreign born, and the majority are Mexican.