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