I would not normally do cardio-lifting in the same day unless I am in a GPP phase. In this case, I do not think it matter much what goes first because you are not focusing on one specific energy system. Hence you can do cardio (interval training) for 20 mins first to warm up your muscles and do maybe a 30 min circuit training with bodyweight, stations, or freeweights. Or you can do the Circuit training first and then do 20 mins interval training which might help with speeding up recovery? There is no right way to atttack it, but it is a matter of preference and need.