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