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