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