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