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