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