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