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