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