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