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