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