This scheme offers one way to interpret your drawing. We consider the right side masculine and the left side feminine. So starting with yourself, you can imagine standing inside the central circle, looking to your right will be your father, looking to your left will be your mother.
Then imagine turning to the right and stepping into your father's circle, looking to the right from there will be his father, looking to the left, his mother.
Likewise, if you imagine turning left from the central circle and stepping into your mother's circle, you will find her father on the right and her mother on the left again.
You can continue doing this throughout the drawing and find out exactly who is who.
This is only one possiblility though and if this does not resonate with you then trust your intuition about where you might find which ancestor.
Intuition always rules in this process!