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