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