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