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