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