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