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