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