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