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