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