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