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