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