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