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