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)(17,18,24,22)(19,21,25,20)(23,30,31,26)(27,28,32,29)(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)(17,19)(18,20)(21,22)(23,27)(24,25)(26,28)(29,30)(31,32)(33,34)(35,42)(36,39)(37,40)(38,41)(43,48)(44,47)(45,46)(17,20,24,21)(18,25,22,19)(23,28,31,29)(26,32,30,27)(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)(17,21,24,20)(18,25,22,19)(23,29,31,28)(26,32,30,27)(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)(17,22,24,18)(19,21,25,20)(23,26,31,30)(27,28,32,29)(33,36,38,35)(34,39,41,42)(37,44,46,43)(40,47,45,48)(1,6,7,14)(2,9,10,16)(3,11,5,13)(4,12,8,15)(17,23,24,31)(18,26,22,30)(19,27,25,32)(20,28,21,29)(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.