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