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)(20,33)(21,27)(22,24)(23,37)(25,32)(26,35)(29,42)(30,45)(31,38)(34,41)(36,40)(39,47)(43,44)(46,48) involution — undirected(1,2,4,5)(3,6,7,8)(9,11,12,16)(10,13,14,15)(18,24)(19,29)(26,33)(27,37)(30,44)(31,32)(40,41)(46,47)(11,16)(13,15)(17,19,22,29)(18,25,24,38)(20,30,35,44)(21,32,23,31)(26,39,33,48)(27,42,37,28)(34,47,36,46)(40,43,41,45)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(17,20)(18,26)(19,30)(21,36)(22,35)(23,34)(24,33)(25,39)(27,41)(28,43)(29,44)(31,47)(32,46)(37,40)(38,48)(42,45)(2,5)(6,8)(17,21,22,23)(18,27,24,37)(19,31,29,32)(20,34,35,36)(25,28,38,42)(26,40,33,41)(30,46,44,47)(39,45,48,43)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.