personally ive not been to osaka university or its minoo campus but ive been to minoo
anyway, from the airport you can either take the train or the bus and get off at osaka/umeda station.
personally i would recommend to take the bus and get off at Hankyu Hotel in Umeda/Osaka, from there its just 2-3 minutes to the Hankyu train which you will be using to get to kita-senri station ( the nearest station to your campus) .
OSAKA UNIVERSITY/Access Map