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