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