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