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