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