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