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