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