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