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