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