http://www.searchenginechannel.com/how-to-disable-or-turn-off-facebook-graph-search/
This is the only workaround to get back old facebook search settings and disable the new facebook graph search. So far Facebook graph search is available for English(US) language but if you change it to any other language then you can get your old setting back. you can change the primary language to English(UK) from account setting and then primary language.
