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