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