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