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