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