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