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