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