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