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