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