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