One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,15)(12,18)(13,21)(14,17)(16,22)(19,24)(20,23)(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)(2,5)(6,7)(9,11,14,12)(10,15,17,18)(13,19,22,20)(16,23,21,24)(27,37)(29,43)(32,47)(34,38)(40,51)(44,56)(48,54)(50,52)(1,2)(3,6)(4,5)(7,8)(9,12,14,11)(10,15,17,18)(13,20,22,19)(16,23,21,24)(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)(1,3,4,8)(2,6,5,7)(9,10)(11,18)(12,15)(13,16)(14,17)(19,24)(20,23)(21,22)(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)(9,13)(10,16)(11,19)(12,20)(14,22)(15,23)(17,21)(18,24)(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) involution — undirected(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.