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