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