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