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