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