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