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