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