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