Wrong question - no answer. Graphite does not melt - it sublimes. Graphite melts only at very high pressure and cannot be compared with other your compounds.
Textbooks inform (the same normal pressure is presumed) that covalent compounds show the lowest melting points, then ionic compounds, and the highest m.p. show eventually covalent networks (if exist at the temperature of melting - may decompose earlier, may sublime at normal pressure, and so on).
You can put in order, eg sodium halides (m.p.) NaF > NaCl > NaBr > NaI,
halides of the same group of the periodic table (but the group should contain only metals or non-metals) and you should compare each halogen separately, I mean - only chlorides, only bromides and so on).
Even then you may encounter some exceptions.