One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(9,10)(11,17)(12,15)(13,16)(14,19)(18,23)(20,22)(21,24)(25,26,32,36,31,37,30,47)(27,38,43,54,42,33,41,50)(28,35,44,51,29,45,46,34)(39,53,55,48,40,49,56,52)(1,3)(2,5)(4,7)(6,8)(9,11,13,19)(10,14,16,17)(12,18,20,24)(15,21,22,23)(25,27,31,42)(26,33,37,38)(28,39,29,40)(30,41,32,43)(34,48,51,52)(35,49,45,53)(36,50,47,54)(44,55,46,56)(3,7)(5,8)(9,12,13,20)(10,15,16,22)(11,18,19,24)(14,21,17,23)(25,28,31,29)(26,34,37,51)(27,39,42,40)(30,44,32,46)(33,48,38,52)(35,36,45,47)(41,55,43,56)(49,50,53,54)(3,7)(5,8)(10,16)(11,19)(15,22)(18,24)(25,29,31,28)(26,35,37,45)(27,40,42,39)(30,44,32,46)(33,49,38,53)(34,36,51,47)(41,55,43,56)(48,50,52,54)(2,6)(5,8)(10,16)(14,17)(15,22)(21,23)(25,30,31,32)(26,36,37,47)(27,41,42,43)(28,44,29,46)(33,50,38,54)(34,45,51,35)(39,55,40,56)(48,53,52,49)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.