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