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