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