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