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