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