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