Yes you can apply for Airman posts offered by Indian air force after passing Diploma in Computer Engineering course . here I am giving you information about required eligibility for airman posts .

GROUP 'X' trades
(Except Education Instructor)
Age limit : 17 - 21 Years

You have to Passed Intermediate / 10+2 / equivalent examination with Mathematics, Physics and English, with minimum 50% marks in aggregate and 50% marks in English
OR
You have to pass a Three years Diploma course in Engineering (Mechanical / Electrical / Electronics / Automobile / Computer Science / Instrumentation Technology / Information Technology) from a well recognized Polytechnic Institute. And you must obtained a minimum 50% marks in overall aggregate, and 50% marks in English in Diploma..

The jobs in IAF under non-technical trade includes:-
Air Field Safety Operator
Aircraft Hands General Duties
Clerk General Duties
Clerk Pay Accounting
Education Instructor
Equipment Assistant
Ground Training Instructor
Indian Air Force Police
Mechanical Transport Drivers
Medical Assistants
Telephonist or Radio or Telephone Operator