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