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