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