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