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)(11,15)(12,16)(13,14)(17,18,23,26)(19,24,21,22)(20,25,29,32)(27,31,30,28)(33,34,38,42)(35,43,45,39)(36,46,47,40)(37,41,44,48)(1,3,7,4)(2,8,6,9)(5,12,13,11)(10,16,14,15)(17,19,23,21)(18,24,26,22)(20,27,29,30)(25,31,32,28)(33,35,38,45)(34,39,42,43)(36,37,47,44)(40,41,46,48)(2,6)(3,4)(5,13)(15,16)(19,21)(22,24)(27,30)(28,31)(33,36,38,47)(34,40,42,46)(35,44,45,37)(39,48,43,41)(1,4,7,3)(2,9,6,8)(5,11,13,12)(10,15,14,16)(17,20,23,29)(18,25,26,32)(19,27,21,30)(22,28,24,31)(33,36)(34,40)(35,37)(38,47)(39,41)(42,46)(43,48)(44,45)(1,5,7,13)(2,10,6,14)(3,11,4,12)(8,15,9,16)(17,21,23,19)(18,22,26,24)(20,27,29,30)(25,31,32,28)(33,37)(34,41)(35,36)(38,44)(39,40)(42,48)(43,46)(45,47)(1,6,7,2)(3,9,4,8)(5,14,13,10)(11,16,12,15)(17,22)(18,19)(20,28)(21,26)(23,24)(25,27)(29,31)(30,32)(33,34)(35,39)(36,40)(37,41)(38,42)(43,45)(44,48)(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.