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