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