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