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