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