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