There is evidence of the Prophet (peace be upon him) raising his hands and making dua while facing the Qibla after burying a deceased person. Thus if someone wishes to make dua after burying a deceased person, they should face the qibla and make dua with their hands raised.
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دلائل:
الفتاوی الھندیۃ: (الباب السادس عشر فی زیاۃ القبور و قرأۃ القرآن فی المقابر، 350/5)
اراد الدعأ یقوم مستقبل القبلۃ کذا فی خزانۃ الفتاویٰ
Allah the Almighty knows best.
Darul ifta Al-Ikhlas, Karachi.