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