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