Cypher is a declarative language, meaning that you tell it what you want and it goes and gets it. In the query you provided, you did not specify an order, and so cypher guarantees no particular order.
If you want your results in a particular order, always use ORDER BY. Never assume that they will come in any particular order, because this is up to Cypher to decide, according to what the most efficient way of executing the query is. Even if Cypher seems to do the same thing every time, there is no guarantee UNLESS you use ORDER BY.