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