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