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