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