Graves has no way to say GTFO XIN, and Xin can gapclose from beyond Graves' range. Some ranged carries have a chance, but I think the only one with a real shot of winning is Vayne.
As other have said I wouldn't sweat it too bad. Everyone is going to have bad game bottom from time to time, especially in blind pick where you can end up with really unfavorable match ups.
I would switch up your summoner spells as suggested, but I don't think it would have made a huge difference in this case.
Sounds like you did everything else right, and asked for help which you did not receive much of.
Xin Zhao is winning now? Not surprised.
© 2015 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.