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