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