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