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