Misappropriation of funds
Misappropriation of funds is a grave misconduct and will invariably lead to termination of employment as it results in a loss of trust and confidence in you. More importantly, it appears that you have been indulging in this for quite some time until you were caught red-handed by the top management.
Seeking an apology and future steps
In my opinion, your management may not be willing to consider your continuation of employment. Therefore, it is better to seek an apology, plead, and obtain a clean relieving letter, and look for alternate employment. If your top management is considerate, they may allow you to continue, but this will be sheer luck.
Regards,
MVK