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