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