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