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