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