One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,11)(5,6)(8,13)(9,16)(10,14)(12,15)(17,18)(19,26)(20,28)(21,24)(22,25)(23,30)(27,29)(31,32)(33,34,39,36)(35,42,37,40)(38,44,46,41)(43,47,45,48)(1,2)(3,7)(4,8)(5,6)(9,15)(10,14)(11,13)(12,16)(17,19,22,24)(18,21,25,26)(20,27,30,31)(23,29,28,32)(33,34,39,36)(35,40,37,42)(38,41,46,44)(43,47,45,48)(2,6)(7,14)(8,11)(15,16)(33,35,39,37)(34,40,36,42)(38,43,46,45)(41,47,44,48)(1,2)(3,7)(4,8)(5,6)(9,15)(10,14)(11,13)(12,16)(17,20)(18,23)(19,27)(21,29)(22,30)(24,31)(25,28)(26,32)(33,36,39,34)(35,40,37,42)(38,44,46,41)(43,47,45,48)(1,3,5,10)(2,7,6,14)(4,12,13,9)(8,16,11,15)(17,21,22,26)(18,24,25,19)(20,29,30,32)(23,31,28,27)(33,37,39,35)(34,40,36,42)(38,45,46,43)(41,47,44,48)(1,4,5,13)(2,8,6,11)(3,9,10,12)(7,15,14,16)(17,18)(19,21)(20,23)(22,25)(24,26)(27,29)(28,30)(31,32)(33,38,39,46)(34,41,36,44)(35,43,37,45)(40,47,42,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.