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