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