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