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