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