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