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)(11,15)(12,14)(13,16)(17,18,21,26,22,25,34,39)(19,23,29,37,28,36,44,47)(20,30,31,38,32,40,33,24)(27,41,43,46,42,48,45,35)(2,5)(3,7)(9,11)(10,13)(12,16)(14,15)(17,19)(18,23)(20,27)(21,29)(22,28)(24,35)(25,36)(26,37)(30,41)(31,43)(32,42)(33,45)(34,44)(38,46)(39,47)(40,48) involution — undirected(11,16)(13,15)(17,20,22,32)(18,24,25,38)(19,27,28,42)(21,33,34,31)(23,35,36,46)(26,40,39,30)(29,45,44,43)(37,48,47,41)(2,5)(6,8)(10,14)(13,15)(19,28)(23,36)(27,42)(29,44)(35,46)(37,47)(41,48)(43,45) involution — undirected(1,3,4,7)(2,6,5,8)(18,25)(23,36)(24,38)(26,39)(30,40)(35,46)(37,47)(41,48)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.