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