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