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