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