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