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