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