The official map of Gran Senda de Malaga indicates that about half of the 35 hiking stages are suitable for bicycles, see
http://static.malaga.es/malaga/subidas/descargas/archivos/5/8/182085/mapa-de-la-gran-senda.pdfI believe you can easily find a detour for the other stages with tools like Ride-with-GPS. Actually Ride-with-GPS has one circular Gran Senda route
https://ridewithgps.com/routes/18022831 . I am not sure whether it is the hiking trail or a bike route.
As I have toured that area several times, as a 15 min entertainment I constructed a circuit myself, fairly haphazard, see
https://ridewithgps.com/routes/31649791Edit :
https://ridewithgps.com/routes/18022831 is the hiking route. You can see this when you select OSM Outdoor as the background map (upper right corner). The GR-249 stages are dotted on the map when you zoom in.
I made a new route that bypasses the steep hiking trails using double-track roads. See
https://ridewithgps.com/routes/31650662 . Compared to my previous route, this one is longer (680 km against 570 km), hillier (17000 m elevation gain against 11000 m) and about 30-40% unpaved. My other route is mainly on pavement.