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