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