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