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