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