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