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