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