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