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