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