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