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