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