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