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