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