Hello,
Scheme colors may vary based on the DOCX. You can see the style number to be used in the Design tab, putting the mouse over each style until you see the style name.
The style 9 is grey in the included base template. You can use your own base template or open the base template to get default styles. Styles 7, 15, 23 are blue schemes in the default template included in phpdocx.
Regards.