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