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