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