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