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