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