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