You are suspended from driving in WA, even though your licence is valid, your right/privilege to drive in WA is suspended.
There is no written legislation that states what you are seeking ie: if you are suspended from driving in WA, but have a valid interstate licence, then you are allowed/not allowed to drive.
The legislation applicable says :
A person who —
(a) drives a motor vehicle on a road while not authorised under the
Road Traffic (Authorisation to Drive) Act 2008 Part 2 to do so; or .............................
You are not authorised to do so as your licence is suspended. If you get pulled over and you produce your valid NSW you may get away with it, if they conduct no checks etc. If they go and do a licence check and search the database they will see you are suspended in WA.