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