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