On days when I swim before work, I hang my suit and towel in a little-used coat-closet in the office. (We have personal lockers at our desks, but they have no ventilation holes, so nothing dries.) Perhaps you can find one somewhere in your workplace for your cycling clothes? Failing that, try to wear more breathable stuff so that the sweat can evaporate into the air before you stop. Slowing down in the last half mile or so can also help.