He said it felt "pretty special" to receive the service award.
"It's been 32 years of my life and I've enjoyed every moment of the job."
Caley's highlights included becoming an intensive care paramedic and completing a postgraduate diploma in paramedic science.
His wife, Karleen Caley was also acknowledged, having served for 22 years.
She joined when she was 17 because her parents were involved.
She initially joined the community side of St John but joined the ambulance section when she was 20.
"It's nice to get recognition of my service ... I've enjoyed being able to do voluntary work and give back to the community."
The couple's children Thomas, 9, and Brendon, 11, are in the local St John youth programme.
St John central region general manager Andrew Boyd said volunteers were needed in the community and made up a vast majority of the numbers in St John.
He said members received service certificates at three, six, and nine years, then a medal at 12 years. From there an award is given for every five years of service.
"There are people here for decades of service.
"It's just a great turnout, there's always a big turnout in Rotorua."
He said it was great to have the support of the mayor, district health board and local MPs at the awards - "it makes it a more special day for those receiving awards".
Rotorua mayor Steve Chadwick thanked St John for building resilient communities and said it was about recognising long service by hardworking individuals within the St John service.
"Thank you for the service you provide. We know you're there if something happens and that's the very safe feeling as a community that we must have."
