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)(19,25)(20,23)(21,24)(22,27)(26,32)(28,30)(29,31)(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)(17,18,21,24)(19,22,27,25)(20,23,30,28)(26,31,29,32)(33,35,38,43)(34,37,41,39)(36,42,46,48)(40,45,44,47)(4,12)(7,15)(11,16)(13,14)(17,18,21,24)(19,22,27,25)(20,23,30,28)(26,31,29,32)(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)(17,18)(19,22)(20,28)(21,24)(23,30)(25,27)(26,32)(29,31)(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)(17,19,21,27)(18,22,24,25)(20,29,30,26)(23,32,28,31)(1,5,6,8)(2,9,10,3)(4,13,12,14)(7,11,15,16)(17,20)(18,23)(19,26)(21,30)(22,31)(24,28)(25,32)(27,29)(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.