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