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