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