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