Name the range Drivers!$A$2:$A$65 as MYROW and
Drivers!$B$2:$B$65 as MYCOL
The in Matrix!B2 use this formula.
=CHOOSE(SUMPRODUCT((MYROW=$A2)*(MYCOL=B$1))+1,"","Y","X")
Copy across and down.
Note that the X is there as row 39 column 15 is in your list twice.
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