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