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