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