var echarts = require('echarts');
require('echarts-graph-modularity');

setOption({

    ...

    series: [{
        type: 'graph',
        layout: 'force',
        // Set modularity property true and extension will automatically detect different communities
        // and assign each different color.
        modularity: true

        // Specify resolution. Higher resolution will produce less communities
        modularity: {
            resolution: 5,
            // If sort the communities
            sort: false
        }

        ...
    }]
})