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