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