If you live in USDA zone 9n (no colder than about 25° F in winter) or higher, you can cut the leaves off once they start to turn yellow.  If you live in any USDA hardiness zone lower than Zone 9 (we are zone 5 here in the Albany NY area) the caladium bulbs will need to be lifted and stored for the winter an replanted outside next mid-May.  HERE A LINK to that procedure.