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