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