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