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