You can override the current style assignments with the STYLEATTRS statement.
styleattrs datacontrastcolors=(green purple);
will set the first value of the group variable to green and the second to purple, so with your data you may need to switch the order the colors appear. You can override fill colors, line colors and patterns as well. Datacontrastcolor is used for markers or boundaries of bars.
If you want to be consistent for the color assignment in multiple graphs you would either make sure the sort order so that the "first" group value is the same.
OR investigate the DATTRMAP data set to allow consistent settings for group values regardless of data order.
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