Vitis Model Composer HDL blocks found in the DSP library contain interfaces that conform to the AXI4 specification. Blocks with AXI4 interfaces are drawn such that ports relating to a particular AXI4 interface are grouped and colored similarly. This makes it easier to identify data and control signals pertaining to the same interface.
Grouping similar AXI4 ports together also makes it possible to use the Simulink Bus Creator and Bus Selector blocks to connect groups of signals together. See AXI Interface for more information on AXI4. For more information on the AMBA AXI4 specification, see the AMD AMBA AXI4 documents found at the AMBA AXI4 Interface Protocol page on the AMD website.