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