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