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