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