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