Here is the bus 32 timetable [both directions]

Bus 32 runs between Leiden train station and ESTEC, Noordwijk. Here is the timetable (with thanks to the Connexion Bus Company)
(and with thanks to weng who did this brilliant copy)

Bus 31 runs between Leiden train station and Katwijk but stops a few minutes walk from ESTEC and bus 40 runs between Leiden train station and central Noordwijk but stops a few minutes walk from ESTEC

Here is a map of The Netherlands (with thanks to KLM Holland Herald magazine). The town of Leiden is located between Amsterdam and Den Haag. Noordwijk aan Zee, where ESTEC is located, is about 10 km Northwest of Leiden