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