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