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