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