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