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