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