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