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