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