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