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)(19,27,29,42)(20,25,31,37)(22,35,34,26)(24,38,36,30)(28,43,32,46)(33,48,44,41)(39,47,40,45)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(18,23)(20,31)(24,36)(26,35)(27,42)(28,32)(33,44)(45,47) involution — undirected(11,15)(13,16)(17,19,22,30,21,29,34,38)(18,24,26,27,23,36,35,42)(20,32,33,47,31,28,44,45)(25,40,41,46,37,39,48,43)(11,15)(13,16)(17,20)(18,25)(19,28)(21,31)(22,33)(23,37)(24,39)(26,41)(27,43)(29,32)(30,45)(34,44)(35,48)(36,40)(38,47)(42,46) involution — undirected(1,3,4,7)(2,6,5,8)(10,14)(13,16)(20,31)(25,37)(28,32)(33,44)(39,40)(41,48)(43,46)(45,47)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.