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