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