Short answer

Be a real friend, whether or not your friend ever becomes Muslim. Start from the one Creator. Surat al-Ikhlas says Allah (﷾) is One and not begotten, and the Mul Mantar also calls God one and unborn. Speak honestly and gently (16:125). Never mock the Gurus, the Guru Granth Sahib, uncut hair or the turban (6:108). If your friend raises the Gurus' deaths under Mughal rulers, say plainly that those deaths were wrong. If your friend quotes Guru Arjan giving up the Muslim prayer, fast and Hajj, admit it plainly. If asked whether you are trying to convert them, say no: only God (﷾) guides hearts (28:56). You are making them aware of Islam in a friendly discussion, not a debate, and the choice is theirs (2:256). If they say no, end as Muslims are taught: "To you be your Way, and to me mine" (109:6). Then keep the friendship. Leave out weak claims, such as 'Guru Nanak was a Muslim' or 'Sikhism is a blend'. Then read the pages written for Sikh readers together, and let the Qur'an speak for itself.

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