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