One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,8)(6,7)(9,13)(10,12)(11,14)(15,16)(17,18,22,25)(19,23,27,20)(21,24,30,32)(26,29,31,28)(33,34,39,37)(35,42,36,40)(38,41,46,45)(43,48,44,47)(4,11)(8,14)(10,15)(12,16)(17,18,22,25)(19,20,27,23)(21,24,30,32)(26,28,31,29)(33,35,39,36)(34,40,37,42)(38,43,46,44)(41,47,45,48)(2,7)(3,9)(8,14)(10,15)(17,19,22,27)(18,23,25,20)(21,26,30,31)(24,29,32,28)(33,34,39,37)(35,40,36,42)(38,41,46,45)(43,47,44,48)(1,3,6,9)(2,5,7,13)(4,10,11,15)(8,12,14,16)(17,19)(18,20)(21,26)(22,27)(23,25)(24,28)(29,32)(30,31)(33,36,39,35)(34,40,37,42)(38,44,46,43)(41,47,45,48)(1,4)(2,8)(3,10)(5,12)(6,11)(7,14)(9,15)(13,16)(17,20)(18,19)(21,29)(22,23)(24,31)(25,27)(26,32)(28,30)(33,37,39,34)(35,40,36,42)(38,41,46,45)(43,48,44,47)(1,5)(2,9)(3,7)(4,12)(6,13)(8,15)(10,14)(11,16)(17,21)(18,24)(19,26)(20,28)(22,30)(23,29)(25,32)(27,31)(33,38,39,46)(34,41,37,45)(35,43,36,44)(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.