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