Pour the sweet rice in your rice cooker. Add the water and stir. Let the rice soak for at least 30 minutes, or up to 4 hours. Add the salt, pandan extract, and green food coloring, then stir. Turn on the rice cooker.
While the rice cooks, warm the coconut milk with the sugar in the small saucepan. Remove from heat and allow too cool to room temperature.
After the rice cooker finishes the cooking cycle, allow the rice to stand 5 more minutes.
For each serving, place a scoop of the warm rice in a bowl or on a plate and drizzle with the coconut milk. Arrange slices of the mango with the rice, then serve.