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