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