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