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