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