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