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