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