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