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