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