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