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