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