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