Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
The situation you describe is somewhat similar to traveling on an airplane. You should try to make wudu before boarding the bus. If there is a bathroom on the bus, then make wudu on the bus.
Usually the time for Fajr is about an hour or more. If the bus stops for a moment, get off and pray during the stop. Keep your wudu ready so you don’t run out of time.
If the bus does not stop, and you have wudu, you can pray on the bus in your seat. If you can stand, you should. If not, sit and perform the prayer by bowing slightly for ruku` and bowing more for prostration.
Since your bus will keep moving in different directions, you do not need to face the qiblah [direction of Makkah]. This prayer will be valid on the bus, due to your exceptional circumstances, and you do not need to make up the prayer after arriving at your village.
Almighty Allah knows best.
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