Could you please suggest the best way to get Holiday Inn Hotel Kowloon east from the HK Airport?

Oh, you must refer to Holiday Inn Express Kowloon East.
Yes, in the airport, you can get a van or hire a mini bus to get to the hotel. Some private vans and mini buses from different companies wait outside the airport. Upon landing, you can inquire some information in the Inquire Service Counter. Or you can ask your hotel whether they have pick-up service or not.