For "quick and easy", if the 3560 supports it, AutoQoS might. (NB: AutoQoS might also do much more that you don't want.)
Otherwise, you'll need provide a manual config. For just ToS 184 (DSCP EF), you would want to insure this value is trusted and it processed in the PQ on egress queues. You would also need to determine what you want to do with all your other traffic.