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