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