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