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