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