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