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