I want to a list view in work order tab of FSL mobile app, where FST can be able to see all the open work orders where he is a resource preference.

That's not possible out of the box. Resource preference is related to the work order and you cannot use this in the list view. Maybe a report could help or if you just have one resource preference, maybe you could use a helper field and some kind of platform automation to populate the right data into the work order field. Then you can use this as filter criteria. 

Keep in mind, in standard field service app configuration, there is no option to see a work orders via list view. 

Maybe with the new app builder option, this is possible, but I didn't try it so far.