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