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