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