Grigoriyev graduated from the Moscow State Institute of International Relations in 1983, and went on to work at the Ministry of Foreign Affairs in a position at the Soviet embassy in Kabul, Afghanistan.
From 2003 – 2006, he was Deputy Director of the Fourth Department of the CIS Countries at the Russian foreign ministry, and from 2006 – 2008, he was an adviser-envoy at the Embassy of Russia in Kabul.
From February 2008, he was again Deputy Director of the Fourth Department of the CIS Countries, specialising in issues relating to Abkhazia and South Ossetia. On 25 October 2008, Russian President Dmitry Medvedev appointed Grigoriyev as the first Ambassador of Russia to Abkhazia, after Russia recognised Abkhazian and South Ossetian independence following the war in August 2008. Grigoriyev presented his Letters of Credence to President of Abkhazia, Sergey Bagapsh on 16 December 2008.
- Falichev, Oleg (15–21 July 2009). СТРАТЕГИЧЕСКИЙ СОЮЗНИК (in Russian). Sukhum and Moscow: VPK News. Retrieved 2009-07-29. Archived at WebCite
- Президент Российской Федерации. Указ №1527 от 25 October 2008 «О назначении Григорьева С.В. Чрезвычайным и Полномочным Послом Российской Федерации в Республике Абхазия». (President of Russia. Ukaz #1527 of 25 October 2008 On the appointment of S.V. Grigoriyev as the Plenipotentiary Ambassador of the Russian Federation to the Republic of Abkhazia. ).
- "Президент Сергей Багапш принял Верительную грамоту оТ Чрезвычайного и Полномочного посла Российской Федерации в Республике Абхазия С.В. Григорьева". President of Abkhazia. 16 December 2008. Retrieved 2009-06-14.
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