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