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