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