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