And this is very helpful:
Once you touch down at the airport, there are three ways for you to get to Parramatta – where the SIO will be held. You can choose to take a cab from the airport direct to Parramatta – a journey that will take around one to one-and-a-half hour. Alternatively, a cheaper option would be to take the Airport Link to Sydney’s CBD Central train station. At the Central station, you need to change to another train that will take you directly to the Parramatta train station. The last, final and FREE option would be to get a friend in Sydney to come and fetch you at the airport!
In fact we locals just walk it. We like to go on walkabouts in this country. Takes about a couple days or so from Kingsford Smith to Parramatta. But that's alright, we stop by at a nearby river, camp and hunt for 'roos and wallabies. Thoroughly recommended!
And no, we don't mind you calling us 'Roos either. Now what do you call them Malaysians?