The alto and the tenor voices will be played by the right hand with 8' registration and the bass - with the 16' and 8' stops in the left hand.
Note that you can play the pedals one octave lower than it's written with the 2' stop.
If your organ doesn't have these higher-pitched stops, what you can do is to simply play the both hands on one manual and use the manual to pedal coupler for the pedals and use 4' or 2' stop from the manual.
Of course, you can use heavier registration and add more stops to the sound but be always aware of the lowest pitch level that each part should be sounding in.
Practice this hymn setting in a slow tempo until you can play it 3 times correctly in a row. Of course, take advantage of playing solo parts and combinations of 2 and 3 parts a few times before putting everything together.
Here is the PDF file for printing. After you complete this exercise, post your time to comments.