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