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