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