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