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