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