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