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