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