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