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