This is the stunningly beautiful larva of the very plain looking tetrio sphinx moth. One of its favorite host plants is Plumeria. If clients are complaining about something chewing up their Plumeria, this is most likely the culprit. We have had two samples of these colorful caterpillars recently brought to our help desk.
See more about this amazing insect here: http://edis.ifas.ufl.edu/in621