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